This plug will fit in a polarized outlet one way. If plug does not fit fully in outlet, reverse the plug. (If plug still does not fit, contact qualified personnel to install proper outlet) Before operating the unit, inspect for visible damage. Be sure the rubber feet are secure, with no signs of deterioration. Do not open the case for any reason; the UV radiation inside can cause eye damage. Connect only to 110/120 volt AC (alternating current). Never connect to DC (direct current). Keep th